| 摘要 |
A device (10, 30, 50) includes a microprocessor or microcontroller and measures real and imaginary parts of complex immittance of a cell or battery (20) at n discrete frequencies, where n is an integer number equal to or greater than 2. The device determines cell/battery properties by evaluating components of an equivalent circuit model comprising 2n frequency-independent elements. Equating real and imaginary parts of measured immittance (60) to values appropriate to the model at the n measurement frequencies (70) defines a system of 2n nonlinear equations. Introducing 2n intermediate variables permits solving these equations and leads to values for the 2n model elements. A table of element values contains virtually the same information as the spectrum of complex immitance over a wide frequency range but provides this information in a more concise form that is easier to store analyze, and manipulate. Thus, the 2n element values may themselves comprise the desired result.
|
